I will say, eventually you did make it "Right" but you need to work on your communication better according to all the stories I've heard involving sales from you. A lot of headaches could be avoided with a simple call or text that takes 5 minutes (tops) of your time, to let the purchaser know whats going on. I imagine its a lot easier being on your end of the deal with knowing what is actually happening. you know where the money is and where the product is. I knew where my money was but didn't know where the part was. And I didn't care about the money so much as the principle of the whole thing.
And if a throttle linkage shows up on my doorstep ( by some miracle) I will gladly send it back or re send the money for it and let everyone on here know that you weren't full of chit and must have actually sent it. But until that happens or you provide a tracking number to back up your claims, i would be hard pressed to take your word for it.